As fellow libertarians, Paul and Johnson share similar sentiments on limited government.

An Emerson College e-poll conducted with a small sample size of 500 registered voters showed Johnson leading Rich among Republicans.

Johnson led a failed campaign for president in the 2016 election, earning him big name recognition, and previously served as New Mexico’s governor in the late '90s and early 2000s.

Marg Elliston, the chair of the New Mexico Democratic Party, said in a statement Tuesday that Paul's endorsement of Johnson was unsurprising.

“Rand Paul is the least surprising DC endorsement Gary Johnson could get," she said. "Both put on a big show about their so-called independence, but at the end of the day, both are rubber stamps for the extreme agenda of today’s Republican Party. We know both would vote to confirm Brett Kavanaugh to the Supreme Court and both want to gut the types of programs that help New Mexico families thrive.”